Write a Steam knockoff platform that's trustworthy enough for people to download, and load it up with dirty games. Put the premium on the customers if they want to use credit card transactions, otherwise push them towards crypto payments. Maybe you won't be an oligarch, but you'll probably end up with a reasonably sized yacht.
[edit] hell, in a few years if the winds shift you might be DraftKings.
Easier said than done. It is hard to earn trust....you would probably need to jumpstart the platform with quite a few indie devs so people start trusting the site and using it.
The US has a weird fetish with privatizing things that the government should handle, like consumer protection. If there were a reasonably robust infrastructure for this outside of payment processors in the US, there would be far less pressure on porn providers to comply with fucked up morals about porn. What we have here is an instance of late stage capitalism, and half the people are too narrowminded to see how it hurts their freedom.